Year	per 1,000
1990	6.640214613657915
1991	6.520973343245539
1992	6.383942780462748
1993	6.277203514511765
1994	6.186587266474953
1995	6.075963036692964
1996	5.971120951051643
1997	5.897182945758378
1998	5.807146698065102
1999	5.741911220715167
2000	5.692793407089637
2001	5.637508744865195
2002	5.63154063926125
2003	5.5424636623378944
2004	5.49315542618288
2005	5.432265192393528
2006	5.347740539496669
2007	5.240460133657458
2008	5.104896515599499
2009	5.205131461138469
2010	4.853922072581474
2011	4.7578918831224275
2012	4.671517321124561
2013	4.627829618589237
2014	4.54913829950931
2015	4.482406461239829
2016	4.44625422620396
2017	4.417893196344304
2018	4.366585656016315
2019	4.307121332342911
2020	4.251994357285654
2021	4.1537119910086915
2022	4.100324223248571